github.com/rohankumardubey/aresdb@v0.0.2-0.20190517170215-e54e3ca06b9c/query/sql/tree/LogicalBinaryExpression.go (about)

     1  //  Copyright (c) 2017-2018 Uber Technologies, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package tree
    16  
    17  import (
    18  	"fmt"
    19  
    20  	"github.com/uber/aresdb/query/sql/util"
    21  )
    22  
    23  // LogicalBinaryExpression is IExpression
    24  type LogicalBinaryExpression struct {
    25  	IExpression
    26  	LogicType LogicalBinaryExpType
    27  	Left      IExpression
    28  	Right     IExpression
    29  }
    30  
    31  // LogicalBinaryExpType is logical binary exp type
    32  type LogicalBinaryExpType int
    33  
    34  const (
    35  	// AND is logic
    36  	AND LogicalBinaryExpType = iota
    37  	// OR is logic
    38  	OR
    39  	// NOOP is logic
    40  	NOOP
    41  )
    42  
    43  // LogicalBinaryExpTypes is logical binary exp type strings
    44  var LogicalBinaryExpTypes = [...]string{
    45  	"AND",
    46  	"OR",
    47  	"NOOP",
    48  }
    49  
    50  // NewLogicalBinaryExpression creates LogicalBinaryExpression
    51  func NewLogicalBinaryExpression(location *NodeLocation, logicType LogicalBinaryExpType,
    52  	left, right IExpression) *LogicalBinaryExpression {
    53  	errMsg := fmt.Sprintf("type is null at (line:%d, col:%d)", location.Line, location.CharPosition)
    54  	util.RequireNonNull(logicType, errMsg)
    55  	errMsg = fmt.Sprintf("left is null at (line:%d, col:%d)", location.Line, location.CharPosition)
    56  	util.RequireNonNull(left, errMsg)
    57  	errMsg = fmt.Sprintf("right is null at (line:%d, col:%d)", location.Line, location.CharPosition)
    58  	util.RequireNonNull(right, errMsg)
    59  
    60  	return &LogicalBinaryExpression{
    61  		NewExpression(location),
    62  		logicType,
    63  		left,
    64  		right,
    65  	}
    66  }
    67  
    68  // Accept accepts visitor
    69  func (e *LogicalBinaryExpression) Accept(visitor AstVisitor, ctx interface{}) interface{} {
    70  	return visitor.VisitLogicalBinaryExpression(e, ctx)
    71  }